AMP Energy (or simply AMP) is an energy drink brand produced and owned by PepsiCo. At the time of its introduction in 2001, AMP Energy was initially distributed under the Mountain Dew soft drink brand. Since 2009, it has been produced and labeled under its own stand-alone trademark name. The beverage is packaged in both 16-ounce and 24-ounce cans, and is sold in the United States and Canada. As of 2009, AMP Energy was the number four energy drink brand in the U.S. in terms of overall retail sales.